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Darwinian approach for dynamic spectrum allocation in next generation systems

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3 Author(s)
Thilakawardana, D. ; Centre for Commun. Syst. Res., Surrey Univ., Guildford ; Moessner, K. ; Tafazolli, R.

The authors present the use of a genetic algorithm (GA) model as a solution approach to the dynamic spectrum allocation (DSA) problem considered as a difficult combinatorial optimisation problem. The proposed multi-objective GA model enhances overall spectral efficiency of the network, while optimising its own spectrum utilisation to generate accessible spectrum opportunities for other radio technologies. A novel two-dimensional encoding technique is defined to represent solutions in the problem domain and the technique enables significantly shorter convergence times. A simulation tool has been developed to model the GA-based DSA and to compare the new scheme with the conventional fixed spectrum allocation (FSA) scheme under both uniform and non-uniform traffic distributions. The proposed scheme significantly outperformed the FSA scheme both in terms of spectral efficiency gain and spectral utilisation.

Published in:

Communications, IET  (Volume:2 ,  Issue: 6 )

Date of Publication:

July 2008

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